I don't have a dog in this fight, but here's how my friend described one he auditioned recently: "The 350 sounded very much like a real Portaflex - or what I think I remember they sounded like back in the day. It had more of an old school vibe - the lows were not as deep and not as articulate (ed. as compared to the 500). That's the same description I'd use for many tube amps. And it was very warm. With a P bass it totally nailed Motown."
"Politics is the art of so plucking the goose as to obtain the most feathers with the least squawking"
- R.G. 2011